mes/src/lib.c

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/* -*-comment-start: "//";comment-end:""-*-
* Mes --- Maxwell Equations of Software
* Copyright © 2016,2017,2018 Jan Nieuwenhuizen <janneke@gnu.org>
*
* This file is part of Mes.
*
* Mes is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or (at
* your option) any later version.
*
* Mes is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Mes. If not, see <http://www.gnu.org/licenses/>.
*/
int g_depth;
SCM fdisplay_ (SCM, int, int);
SCM
display_helper (SCM x, int cont, char* sep, int fd, int write_p)
{
fputs (sep, fd);
if (g_depth == 0) return cell_unspecified;
g_depth = g_depth - 1;
switch (TYPE (x))
{
case TCHAR:
{
fputs ("#\\", fd);
fputc (VALUE (x), fd);
break;
}
case TCLOSURE:
{
fputs ("#<closure ", fd);
display_helper (CDR (x), cont, "", fd, 0);
fputs (">", fd);
break;
}
case TFUNCTION:
{
fputs ("#<procedure ", fd);
char const *p = "?";
if (FUNCTION (x).name != 0)
p = FUNCTION (x).name;
fputs (p, fd);
fputs ("[", fd);
fputs (itoa (CDR (x)), fd);
fputs (",", fd);
fputs (itoa (x), fd);
fputs ("]>", fd);
break;
}
case TMACRO:
{
fputs ("#<macro ", fd);
display_helper (CDR (x), cont, "", fd, 0);
fputs (">", fd);
break;
}
case TNUMBER:
{
fputs (itoa (VALUE (x)), fd);
break;
}
case TPAIR:
{
if (!cont) fputs ("(", fd);
if (CAR (x) == cell_circular)
{
fputs ("(*circ* . ", fd);
int i = 0;
x = CDR (x);
while (x != cell_nil && i++ < 10)
{
fdisplay_ (CAAR (x), fd, write_p); fputs (" ", fd);
x = CDR (x);
}
fputs (" ...)", fd);
}
else
{
if (x && x != cell_nil) fdisplay_ (CAR (x), fd, write_p);
if (CDR (x) && TYPE (CDR (x)) == TPAIR)
display_helper (CDR (x), 1, " ", fd, write_p);
else if (CDR (x) && CDR (x) != cell_nil)
{
if (TYPE (CDR (x)) != TPAIR)
fputs (" . ", fd);
fdisplay_ (CDR (x), fd, write_p);
}
}
if (!cont) fputs (")", fd);
break;
}
case TSPECIAL:
case TSTRING:
case TSYMBOL:
{
if (write_p && TYPE (x) == TSTRING) fputc ('"', fd);
SCM t = CAR (x);
while (t && t != cell_nil)
{
fputc (VALUE (CAR (t)), fd);
t = CDR (t);
}
if (write_p && TYPE (x) == TSTRING) fputc ('"', fd);
break;
}
default:
{
fputs ("<", fd);
fputs (itoa (TYPE (x)), fd);
fputs (":", fd);
fputs (itoa (x), fd);
fputs (">", fd);
break;
}
}
return 0;
}
SCM
display_ (SCM x)
{
g_depth = 5;
return display_helper (x, 0, "", g_stdout, 0);
}
SCM
display_error_ (SCM x)
{
g_depth = 5;
return display_helper (x, 0, "", STDERR, 0);
}
SCM
display_port_ (SCM x, SCM p)
{
assert (TYPE (p) == TNUMBER);
return fdisplay_ (x, VALUE (p), 0);
}
SCM
write_ (SCM x)
{
g_depth = 5;
return display_helper (x, 0, "", g_stdout, 1);
}
SCM
write_error_ (SCM x)
{
g_depth = 5;
return display_helper (x, 0, "", STDERR, 1);
}
SCM
write_port_ (SCM x, SCM p)
{
assert (TYPE (p) == TNUMBER);
return fdisplay_ (x, VALUE (p), 1);
}
SCM
fdisplay_ (SCM x, int fd, int write_p) ///((internal))
{
g_depth = 5;
return display_helper (x, 0, "", fd, write_p);
}
SCM
exit_ (SCM x) ///((name . "exit"))
{
assert (TYPE (x) == TNUMBER);
exit (VALUE (x));
}
SCM
xassq (SCM x, SCM a) ///for speed in core only
{
while (a != cell_nil && x != CDAR (a)) a = CDR (a);
return a != cell_nil ? CAR (a) : cell_f;
}